69 lines
2.0 KiB
Go
69 lines
2.0 KiB
Go
package handler
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import (
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"io/fs"
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"net/http"
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"path"
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"strings"
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)
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// indexHandler 服务嵌入式前端首页 web/static/index.html。
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func indexHandler(fsys fs.FS) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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b, err := fs.ReadFile(fsys, "index.html")
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if err != nil {
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http.Error(w, "前端页面尚未构建：请在 frontend 目录执行 pnpm build", http.StatusNotFound)
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return
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}
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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_, _ = w.Write(b)
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}
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}
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// mimeFallback 构建产物常见静态资源的 Content-Type 兜底表
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// （mime.TypeByExtension 在部分 Windows 环境依赖系统注册表，结果不稳定）。
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var mimeFallback = map[string]string{
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".html": "text/html; charset=utf-8",
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".css": "text/css; charset=utf-8",
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".js": "text/javascript; charset=utf-8",
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".mjs": "text/javascript; charset=utf-8",
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".json": "application/json; charset=utf-8",
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".svg": "image/svg+xml",
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".png": "image/png",
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".jpg": "image/jpeg",
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".jpeg": "image/jpeg",
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".gif": "image/gif",
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".ico": "image/x-icon",
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".woff": "font/woff",
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".woff2": "font/woff2",
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".ttf": "font/ttf",
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".webp": "image/webp",
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}
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// assetHandler 服务 vite 构建产物 /assets/<file>。
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// 前端使用 hash 路由，静态托管只需覆盖根路径与扁平的 assets 目录。
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func assetHandler(fsys fs.FS) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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name := strings.TrimPrefix(r.URL.EscapedPath(), "/assets/")
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if name == "" || strings.ContainsAny(name, `/\`) || strings.Contains(name, "..") {
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http.NotFound(w, r)
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return
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}
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if _, err := fs.Stat(fsys, "assets/"+name); err != nil {
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http.NotFound(w, r)
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return
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}
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ct := mimeFallback[strings.ToLower(path.Ext(name))]
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if ct == "" {
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ct = "application/octet-stream"
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}
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w.Header().Set("Content-Type", ct)
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w.Header().Set("Cache-Control", "public, max-age=31536000, immutable") // vite 产物带内容哈希
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b, err := fs.ReadFile(fsys, "assets/"+name)
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if err != nil {
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return
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}
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_, _ = w.Write(b)
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}
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} |